90 IBM Midrange System Storage Hardware Guide
When six enclosures are required, the same method is employed again, maintaining drive
channel redundancy and using both controllers, as shown in Figure 3-67.
Figure 3-67 DS5020 drive-side cabling with six EXPs
Drive-side cabling example
As shown in Figure 3-67, the DS5020 is cabled using all two-drive channel pairs, assuming
that there are six expansion enclosures (EXP) evenly spread out across the drive channel
pairs (three enclosures each).
Port 1, drive channel 2
Port 2, drive channel 2
Port 1, drive channel 1
Port 2, drive channel 1
Drive channel
pair #1
ESM module
Drive channel
pair #2
EXP
DS5020
EXP
EXP
EXP
EXP
EXP
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